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Our in-tree SHA-1 wrappers all define platform_SHA_CTX and related macros to point at the opaque "context" type, init, update, and similar functions for each specific implementation. In hash.h, we use these platform_ variables to set up the function pointers for, e.g., the_hash_algo->init_fn(), etc. But while these header files have a header-specific macro that prevents them declaring their structs / functions multiple times, they unconditionally define the platform variables, making it impossible to load multiple SHA-1 implementations at once. As a prerequisite for loading a separate SHA-1 implementation for non-cryptographic uses, only define the platform_ variables if they have not already been defined. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/* wrappers for the EVP API of OpenSSL 3+ */
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#ifndef SHA1_OPENSSL_H
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#define SHA1_OPENSSL_H
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#include <openssl/evp.h>
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struct openssl_SHA1_CTX {
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EVP_MD_CTX *ectx;
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};
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typedef struct openssl_SHA1_CTX openssl_SHA1_CTX;
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static inline void openssl_SHA1_Init(struct openssl_SHA1_CTX *ctx)
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{
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const EVP_MD *type = EVP_sha1();
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ctx->ectx = EVP_MD_CTX_new();
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if (!ctx->ectx)
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die("EVP_MD_CTX_new: out of memory");
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EVP_DigestInit_ex(ctx->ectx, type, NULL);
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}
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static inline void openssl_SHA1_Update(struct openssl_SHA1_CTX *ctx,
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const void *data,
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size_t len)
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{
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EVP_DigestUpdate(ctx->ectx, data, len);
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}
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static inline void openssl_SHA1_Final(unsigned char *digest,
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struct openssl_SHA1_CTX *ctx)
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{
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EVP_DigestFinal_ex(ctx->ectx, digest, NULL);
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EVP_MD_CTX_free(ctx->ectx);
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}
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static inline void openssl_SHA1_Clone(struct openssl_SHA1_CTX *dst,
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const struct openssl_SHA1_CTX *src)
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{
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EVP_MD_CTX_copy_ex(dst->ectx, src->ectx);
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}
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#ifndef platform_SHA_CTX
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#define platform_SHA_CTX openssl_SHA1_CTX
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#define platform_SHA1_Init openssl_SHA1_Init
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#define platform_SHA1_Clone openssl_SHA1_Clone
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#define platform_SHA1_Update openssl_SHA1_Update
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#define platform_SHA1_Final openssl_SHA1_Final
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#endif
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#endif /* SHA1_OPENSSL_H */
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